Arnold Arboretum
- The Arnold Arboretum is a research and educational institution. It manages a collection of hardy trees, shrubs, and vines located in Boston, Massachusetts and associated herbarium and library collections.

How to Grow and Maintain Birch Trees
- Learn how to care for a birch tree, including selecting the correct site and type of birch, watering, fertilizing, mulching, and monitoring for problems.

How to Plant Trees
- Gives information on where to use trees and how to plant them correctly.

Ice Damage On Trees
- Heavy accumulations of snow and ice can cause major structural damage to trees and shrubs. The damaged limbs should be properly removed. The following links will provide a guide for homeowners seeking to repair damaged plant material.U.of Illinois

Monthly Tree Tips
- Monthly guide to caring for trees from the Massachusetts Arborists Association, including a featured tree for each month.

State and Provincial Trees
- A list of official state and provincial trees of all 50 U.S. states and 13 Canadian provinces and territories including both common and scientific names and images of official flags.

Tree Trail
- Contains descriptions of rare trees native to the Eastern United States, and provides information about growing them on private property.

Tree-care.info
- Information on many aspects of tree care. Includes an advice forum and help finding a tree surgeon in the UK.

TreeHelp.com
- Source of information regarding tree and shrub care including how-to articles, species profiles, insect and disease information and other features.

TreeLink
- Resource for urban and community forestry: planting and caring for trees in cities and towns. Includes links list, research, news, forums, and educational materials.

TreePeople
- Offers information on how to properly plant and maintain a tree. Organization is non-profit, and is working to offer sustainable solutions to the Los Angeles area.

The Trees of Reed College
- Offers photographs and descriptions for a variety of trees that can be found on the campus of Reed College in Portland, Oregon. Visitors can identify trees by location or find the location of examples of a certain kind of tree.

West Coast Native Tree ID
- A dichotomous key to identify trees native to the West coast of the United States. Includes photos and information on these trees.

What tree is it?
- Provides a few simple methods to quickly identify any unknown tree.

What Tree Is That?
- Arbor Day Society's online tree identification site for Eastern/Central and Western USA trees.

The WVU Tree Bark Home Page
- Designed to provide a place to learn about the anatomy and physiology of tree bark, fungal canker diseases that affect tree bark, the wound responses of injured tree bark, and the role of wound responses in the resistance of living tree bark to wound pathogens.